Hyundai Steel Company

Hyeong Hyeop Do

Byung Gil Yoo

Chee Woong Song

Soon Geun Jang

Sang Mun Hong

Do Hak Kim

Young Mun Shin

Sung Yul Huh

Hee Joong Lim

In accordance with one aspect of the present disclosure, there is provided a steel material for a tailor-welded blank, including 0.04 to 0.06 wt % of carbon (C), 1.2 to 1.5 wt % of manganese (Mn), 0.01 to 0.10 wt % of titanium (Ti), 0.01 to 0.10 wt % of niobium (Nb), and the balance of iron (Fe) and inevitable impurities; having a tensile strength (TS) of 550 MPa or greater, a yield strength (YS) of 300 MPa or greater, and an elongation (EL) of 20% or greater; and having a dual-phase structure of ferrite and martensite.

Steel material for taylor welded blank and method for manufacturing hot-stamped part using same steel

A method for manufacturing a hot-stamped part includes reheating a steel slab at a temperature of 1,200&#xb0; C. to 1,250&#xb0; C., the steel slab including, by wt %, 0.20 to 0.50% carbon (C), 0.05 to 1.00% silicon (Si), 0.10 to 2.50% manganese (Mn), more than 0% and not more than 0.015% phosphorus (P), more than 0% and not more than 0.005% sulfur (S), 0.05 to 1.00% chromium (Cr), 0.001 to 0.009% boron (B), 0.01 to 0.09% titanium (Ti), and a balance of iron (Fe) and inevitable impurities; finish-rolling the reheated steel slab at a temperature of 880&#xb0; C. to 950&#xb0; C.; cooling the hot-rolled steel plate without using water, and coiling the cooled steel plate at a temperature of 680&#xb0; C. to 800&#xb0; C. to form a hot-rolled decarburized layer on a surface of the steel plate; pickling the coiled steel plate, followed by cold rolling; annealing the cold-rolled steel plate in a reducing atmosphere; plating the annealed steel plate; and hot-stamping the plated steel plate.

Hot-stamped part and method for manufacturing same

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Hyeong Hyeop Do